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Vacuum issue I think/Hub engage
I just purchased a used 2005 Powerstroke Lariat crew cab, love it and have some cool mods on tap. But driving it home I noticed that the AC was stuck in the Defrost mode. It started raining and got cooler and all of the sudden the AC started working correctly. It works correctly until I turn the AC off, then turn it back on. Then it takes a while (two hours or so) to get off of the defrost..
Second thing, I think my hubs are stuck in the locked on position. When I shift it to the 4x4 position the truck goes into four wheel drive but there is no audible sounds or anything, unlike in my Chevy. When I turn it back to two wheel drive, it goes back into two wheel drive, but there is no sounds of disengagement or anything.
After looking over the forum I think that it is something with the vacuum pump. What do you guys think? Great forum guys.